Apparatus for making leaden powder



July 3, 1928.

c. A. HALL APPARATUS FOR MAKING LEADER POWDER Original File d mm 29,1924 WITNESS. WWW

Patented July 3, 1928.

UNITED STATES PATENT OFFICE.

. APPARATUS FOR MAKING LEADEN POWDER.

Application filed March 29,1924, Serial No. 702,890. Renewed December 2,1927.

The principal object of the present in'- vention is to provide anapparatus for use in the manufacture of leaden powder of the order oflead oxides. Another object of the invention is to provide such anapparatus with appropriately independent controls whereby the characterand quality of the product in respect to oxygen content-can be varied toestablish different products and to permit of the manufacture of anyestab lished product in such a way that it is of uniform quality. Afurther object of the invention is to provide for the dissipation of theheat evolved by quantity production in excess of the heat permissiblefor the successful accomplishment of the chemical reaction. Additionalobjects of the invention at the end of which the invention will beclaimed.

The invention comprises the improvements to be finally claimed andpresently described in connection with the accompanying drawings formingpart hereof and in which the single figure 1s a view partly in section,but principally in side elevation, schematically or diagrammaticallyillustrating features of apparatus embodying or containing one form ofthe invention.

In the drawing, 1 is a hollow drum of the general form of reverselydisposed conic frustums extending from a cylindrical center portion.'This drum provides a closed curved wall. The drum is revoluble about asubstantially horizontal axis. However, as shown, the axis is slightlyinclined from left to right in the direction of feed of the solidmaterial. 17 indicates bearings in which the drum is revoluble. Toothedgearlng 18 represents a means for driving the.

drum and the part 19 of this gearing which is carried by the drum isshown as broken away for the sake of clearness although it extends allthe way around the surface-of the drum.' 4 is a feeder at'the inlet endof the drum and it communicates with the interior of the drum by way ofthe passage 20 and through the hollow trunnion of the drum. The rotarpocketed element 21 is a means for enclosing the feeder against theentranceof air while permittingo'f the introduction of balls or lumps oflead into the drum. '6.is an enclosed delive hopper at the outletend ofthe drum and 1t communicates with the interior of the drum through...

a hollow trunnion. The delivery hopper 6 lead oxide.

produced and if desired, may be returnedto the interior of the drum forfurther treat ment. 5 is a means, shown as awater spray device, forapplying coolin fluid to the ex terior of the curved wall 0 the drum.The fan 2, the conduit 3, and the pipe 9 constitute a means for passinga stream of air axially through the drum in either direction and, asshown, the direction is from left to right. dust bag having an outlet 12to the-atmosphcre, and .thesedust catching devices are tion will appearfrom the following descriparranged in series with the outletof. the pipe9. 14 is a damper for controlling the volume of air flowing through thedrum, and 13 is a thermometer arranged generally centrally of theinterior of the drum and provided with a dial 22. In generalthere isprovided an air containing rumble 1 rotated at a speed appropriate forquantity production, and there are means for diss1 ating heat evolved bythe action of the rum le on lead balls or lumps contained therein inexcess of the heat appropriate for the chemical reaction. These heatdissipating means operate independently of the speed of revolution ofthe'rumble, and since they comprise air control and cooling fluidapplica- '-tion they are independent of each other.

In use the air containing rumble 1 supplied-with balls or lumps of leadis rotated at a speed determined for quantity production of the leadenpowder. This results in the evolution of heat in excess of thatappropriate for the formation of owdered The excess heat is issipatedeither b the application of fluid to'the exterior o the rumble, forexample at 5, or by control of the volume of air as at 14., or by thecombined use of both ,of these instrumentalities. When the rumble is ofthe form shown, it is necessar to feed lead balls or 10 is a dustcatcher, and 11 is a.

lumps into it in or er that the powdered oxide will escape from itinto-the delivery hopper-6, fromwhich it'is'removed as by way of theoutlet 7 for use. The dust caught in the dust catchers 10 and 11 mayalso be collected and used. If coarse matreatment. The thermometer 13 isa means vterial is removed from 8 it can be returned to the interior ofthe rumble 1 for further for ascertaining the temperature in theinterior of the drum 1, so that the necessary controls 14, 5, or both,can be regulated. In some cases the speed of revolution of the drum canbe reduced in order to avoid the evolution of too much heat for thesuccessful production of leaden oxide but reduction of the speed ofrevolution of the drum 1 is accom anied by diminution in the quantity ofpro action.

It will be obvious to those skilled in the art to which the inventionrelates that modifications ma be made in details of construction anoperation without departing from the spirit of the invention which isnot limited as to those matters or otherwise than as the state of theprior art and the appended claim may require.

I claim: Apparatus for making leaden powder comprising in combination -ahollow drum of the general form of reversely ,disposed drum, controlledmeans for spraying cooling fluid onto the exterior of the drum, andcontrolled air connections for passing a stream of air axially throughthe drum, said cooling fluid means and said air connections beingindependently operatable for dissipating the excess of evolved heat overthe limited degree of heat appropriate for the success of the chemicalreaction between the air andlead.

CLARENCE A. HALL.

